Improve scaling vs pan in screen magnifier.
1. Due to frequent changes of the behavior of ScaleGestureDetector
this patch rolls in a gesture detector used for changing the
screen magnification level. It has an improved algorithm which
uses the diameter of min circle around the points as the span, the
center of this circle as the focal point, and the average slop
of the lines from each pointer to the center to determine the
angle of the diameter used when computing the span x and y.
Change-Id: I5cee8dba84032a0702016b8f9632f78139024bbe
1 file changed